JP2013204431A - Pump device, and method of manufacturing pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump device securing a significant space for forming a drive circuit in a circuit board.SOLUTION: A pump device 1 includes an annular wall section 20 and a plate-like wall section 21 blocking one side of the annular wall section 20. A stator 5 includes drive coils 4 disposed in a circular form, and is fixed to an outer peripheral side of the annular wall section 20. Each drive coil 4 includes a terminal pin 35 projecting in the center axis L direction. A circuit board 7 is fixed to the plate-like wall section 21, and is arranged in a state where, when viewed from the center axis L direction, it is orthogonal to the center axis L direction at positions overlapping the plurality of drive coils 4. The circuit board 7 includes a plurality of through holes 47 for terminal pins through which the terminal pins 35 of respective drive coils 4 are penetrated. A fastening mechanism 49 for fixing the circuit board 7 to a partition wall 18 is formed at a position separated on a radial outside from the central axis L. Therefore, a significant space can be secured inside the plurality of through holes 47 for terminal pins.

Description

  The present invention relates to a pump device in which a circuit board is fixed to a partition wall separating a pump chamber in which an impeller is disposed and a stator, and a method for manufacturing the pump device.

  A rotor to which an impeller is attached, an annular stator having a plurality of annular drive coils, and a circuit board for controlling power supply to the plurality of drive coils are provided. Patent Document 1 discloses a pump device in which a pump chamber and a stator and a circuit board are separated by a partition wall.

  In the pump device of Patent Document 1, the partition wall includes an annular wall portion formed coaxially with the central axis of the plurality of drive coils, and a plate-like wall portion blocking one side of the annular wall portion in the central axis direction. I have. The stator is fixed to the outer peripheral side of the annular wall portion, and each drive coil includes a terminal pin that protrudes in the direction of the central axis in a state where the terminal portion of the coil wire is entangled. The circuit board has a circular shape and is arranged in a state perpendicular to the central axis direction at a position overlapping with the plurality of drive coils when viewed from the central axis direction. The circuit board is fixed to the plate-like wall portion, and the fastening mechanism for fixing the circuit board to the partition wall is configured on the center of the circuit board, that is, on the central axis. The circuit board is provided with a plurality of through holes arranged in an annular shape along the outer peripheral edge of the circuit board, and terminal pins of the respective drive coils are passed through the respective through holes.

JP 2007-288959 A

  In the pump device of Patent Document 1, a fastening mechanism for fixing the circuit board to the partition is formed at the center of the circuit board. Moreover, the terminal pin of each drive coil has penetrated the outer peripheral part of the circuit board over the perimeter. As a result, there is no space on the circuit board, and there is a problem that the degree of freedom in designing the wiring pattern of the drive circuit configured on the circuit board is low.

  In view of such a problem, an object of the present invention is to provide a pump device and a method of manufacturing the pump device that can secure a unitary space for configuring a drive circuit on a circuit board.

In order to solve the above problems, the pump device of the present invention is
A rotor to which an impeller is attached;
A stator comprising a plurality of drive coils arranged in a ring;
A drive circuit for performing power feeding control to the plurality of drive coils, and when viewed from the central axis direction of the plurality of drive coils, is in a state orthogonal to the central axis direction at a position overlapping the plurality of drive coils. A placed circuit board; and
The pump chamber in which the impeller is disposed and the circuit board and the stator are separated from each other, and a partition wall to which the circuit board and the stator are fixed,
Each drive coil includes a terminal pin that protrudes in the direction of the central axis in a state where the terminal portion of the coil wire is entangled,
The circuit board includes a plurality of through holes through which the terminal pins of the respective drive coils penetrate, and a wiring pattern of the drive circuit in which terminal portions of the coil wires are electrically connected,
The fastening mechanism that fastens the circuit board and the partition is provided at a position away from the central axis in the radial direction.

  According to the present invention, the fastening mechanism for fixing the circuit board to the partition wall is provided at a position radially outward from the central axis, so that the fastening mechanism is provided on the central axis. As a result, it is easy to secure a uniform space on the circuit board. Therefore, when the wiring pattern of the drive circuit is formed on the circuit board, the degree of freedom in designing the wiring pattern is improved.

  In the present invention, it is preferable that the driving circuit includes a driving IC for controlling power feeding to the plurality of driving coils, and the driving IC is disposed on the central axis of the circuit board. In this way, it becomes easy to mount a relatively large electronic element such as a driving IC.

  In the present invention, a connector for supplying electric power from the outside to the drive circuit is provided, and the connector is provided on an outer peripheral edge portion of the circuit board located on the opposite side of the fastening mechanism across the central axis. It is desirable to be electrically connected to the wiring pattern in a fixed state. In this way, a collective space for forming a wiring pattern in a portion close to the connector can be secured, so that power loss can be suppressed.

  In the present invention, in order to prevent the liquid flowing through the pump chamber from being applied to the drive coil and the circuit board, the pump chamber in the partition wall while covering a part of the stator, the circuit board, and the connector It is desirable to provide a resin sealing member fixed to the opposite surface.

  In the present invention, the connector includes a connector terminal extending in parallel with the circuit board, and the wiring pattern includes a connector connection land in which the connector terminal is soldered to an outer peripheral edge portion of the circuit board. It is desirable. In this way, the joint strength by soldering can be improved by lengthening the connection portion between the connector terminal and the connector connection land.

  In the present invention, a connector fixing mechanism for fixing the connector to the circuit board is provided, and the connector fixing mechanism is provided on both sides of the circuit board in the circumferential direction of the connector connecting land. A fixing part and the connector WHEREIN: The connector side fixing | fixed part provided in the both sides of the circumferential direction of the said connector terminal shall be provided. If such a connector fixing mechanism is provided, the connector and the circuit board can be firmly fixed.

  In the present invention, it is desirable that the gate mark of the resin sealing member is located more radially outside the circuit board and closer to the fastening mechanism than the connector. According to such a configuration, when the resin sealing member is molded using the mold, the gate is configured near the fastening mechanism, and the resin is injected from the vicinity of the fastening mechanism. Therefore, it is possible to suppress the circuit board from being bent by the injected resin.

  In this case, the gate trace is provided on the side of the plurality of drive coils with respect to the circuit board in the central axis direction, and the wiring pattern is on the side opposite to the plurality of drive coils on the circuit board. It is desirable to be provided on the substrate surface. In this way, when the resin sealing member is molded using the mold, the gate is configured on the side opposite to the substrate surface, and the resin is injected from the side opposite to the substrate surface. Therefore, it is possible to prevent or suppress the wiring pattern provided on the circuit board from being peeled off by the injected resin.

  In the present invention, in order to suppress the separation of the driving IC from the circuit board, the gate mark is a single place, and when viewed from the central axis direction, the gate mark, the fastening mechanism, and the central axis line The drive IC and the connector are preferably located on a straight line.

  In this case, the driving IC has a rectangular planar shape when viewed from the central axis direction, and the longitudinal direction is orthogonal to a virtual straight line connecting the gate mark, the fastening mechanism, the central axis, the driving IC and the connector. It is desirable that In this way, when the resin sealing member is molded, the length of the drive IC in the direction in which the circuit board is easily bent can be shortened. Accordingly, it is possible to prevent the driving IC from being peeled off or damaged from the substrate.

  In the present invention, each drive coil includes a coil bobbin around which the coil wire is wound, and a terminal portion of the coil wire of each drive coil is in a state in which a gap between the coil bobbin and the terminal pin is loosened. It is desirable that If it does in this way, when shape | molding a resin sealing member, it can prevent or suppress that the terminal part of a coil wire is cut | disconnected by the resin inject | poured.

Next, the present invention provides the above pump device manufacturing method,
Fixing the connector to the circuit board and fixing the stator and the circuit board to the partition;
The stator and the circuit board are disposed in a mold, and the outer peripheral edge portion of the partition wall and the connector connecting portion protruding outward from the circuit board in the connector are held by the mold,
The resin sealing member is molded by injecting resin into the mold from a position closer to the radial direction than the circuit board and closer to the fastening mechanism than the connector.

  According to the present invention, when the resin sealing member is molded using the mold, the resin is injected from the vicinity of the fastening mechanism that fastens the circuit board and the partition wall. Bending can be suppressed.

  According to the present invention, it is possible to secure a collective space where a drive IC or the like can be arranged on a circuit board.

It is sectional drawing of the pump apparatus concerning embodiment of this invention. It is a perspective view of a partition, a stator, a circuit board, and a connector. It is a disassembled perspective view of a partition and a stator. It is the top view which looked at the partition, the stator, the circuit board, and the connector from the lower part. It is sectional drawing of a partition, a stator, a circuit board, and a connector.

  Hereinafter, a pump device according to an embodiment of the present invention will be described with reference to the drawings.

(overall structure)
FIG. 1 is a cross-sectional view of a pump device 1 according to an embodiment of the present invention. In the following description, the upper side (Z1 direction side) in FIG. 1 is the “upper” side, and the lower side (Z2 direction side) in FIG. 1 is the “lower” side.

  The pump device 1 according to the present embodiment is a type of pump called a canned pump, and includes a rotor 3 having a drive magnet 2, a stator 5 having a plurality of drive coils 4 arranged in an annular shape, and a plurality of drive coils 4. A circuit board 7 including a drive circuit 6 for controlling power feeding is provided. An impeller 8 is attached to the rotor 3, and a connector 9 for supplying electric power to the drive circuit 6 from the outside is attached to the circuit board 7. The impeller 8, the rotor 3, the stator 5, and the circuit board 7 are disposed inside the case body 11, and the connector connection portion 9 a that is a connection portion with the outside in the connector 9 is exposed from the case body 11. . The case body 11 includes a housing 12 and an upper case 13 that covers the upper portion of the housing 12. The housing 12 and the upper case 13 are fixed to each other by screws 14.

  The upper case 13 is formed with a fluid suction portion 13a and a fluid discharge portion 13b. A pump chamber 15 is formed between the housing 12 and the upper case 13 through which the fluid sucked from the suction portion 13a passes toward the discharge portion 13b. A seal member (O-ring) 16 for ensuring the sealing property of the pump chamber 15 is disposed at a joint portion between the housing 12 and the upper case 13. The housing 12 includes a partition wall 18 and a resin sealing member 19 fixed to the partition wall 18 so as to cover the lower surface and side surfaces of the partition wall 18. The partition wall 18 includes an annular wall portion 20 provided coaxially with the central axis L, a disk-like plate-like wall portion 21 that closes the lower end of the annular wall portion 20, and a radially outer side from the upper end portion of the annular wall portion 20. A partition wall ridge 22 that extends toward the top is provided, and the upper side of the partition wall ridge 22 is a pump chamber 15. The partition wall 18 separates the pump chamber 15, the impeller 8 and the rotor 3 from the stator 5 and the circuit board 7.

  When power is supplied to the plurality of drive coils 4 via the drive circuit 6, the rotor 3 rotates about the central axis L. Thus, when the impeller 8 rotates in the pump chamber 15, the fluid is sucked into the pump chamber 15 from the suction portion 13a and discharged from the discharge portion 13b.

(Rotor)
As shown in FIG. 1, the rotor 3 includes a drive magnet 2, a sleeve 24, and a holding member 25 that holds the drive magnet 2 and the sleeve 24. The holding member 25 includes a cylindrical portion 26 and a flange portion 27 that extends in the radial direction above the cylindrical portion 26, and the impeller 8 is fixed to the flange portion 27. The drive magnet 2 is fixed to the outer peripheral side of the cylindrical portion 26. The sleeve 24 has a cylindrical shape and is fixed to the inner peripheral side of the cylindrical portion 26.

  The rotor 3 is rotatably supported on the fixed shaft 28. The upper end of the fixed shaft 28 is held by the upper case 13, and the lower end of the fixed shaft 28 is held by the upper surface portion of the plate-like wall portion 21 of the partition wall 18. The axis of the fixed shaft 28 extends in the vertical direction. Here, the axis of the fixed shaft 28 is the rotation center line of the rotor 3, and is the center axis L of the plurality of drive coils 4 arranged in an annular shape.

  The fixed shaft 28 is inserted into the inner peripheral side of the sleeve 24. In addition, two thrust bearing members 29 are attached to the fixed shaft 28 so as to sandwich the sleeve 24 in the vertical direction. In this embodiment, the sleeve 24 functions as a radial bearing for the rotor 3, and the sleeve 24 and the thrust bearing member 29 function as a thrust bearing for the rotor 3. The impeller 8 is disposed inside the pump chamber 15. That is, the impeller 8 is disposed on the outer side (upper side) of the annular wall portion 20 in the central axis L direction. The drive magnet 2 of the rotor 3 is disposed inside the annular wall portion 20 of the partition wall 18. That is, the drive magnet 2 is disposed at a position that is displaced downward from the pump chamber 15 in the direction of the central axis L.

(Stator)
FIG. 2 is a perspective view of the partition wall 18, the stator 5, the circuit board 7, and the connector 9. FIG. 3 is an exploded perspective view of the partition wall 18 and the stator 5. As shown in FIGS. 1 and 3, the stator 5 includes a plurality of drive coils 4 arranged in an annular shape, and a stator core 30 that supports the plurality of drive coils 4. As shown in FIGS. 2 and 3, in this example, the stator 5 includes twelve drive coils 4 (1) to 4 (12). The stator 5 is attached to the outer peripheral side of the annular wall portion 20 of the partition wall 18, and the plurality of drive coils 4 (1) to 4 (12) are connected to the drive magnet 2 of the rotor 3 in the radial direction via the annular wall portion 20. Opposite (see FIG. 1).

  The stator core 30 is a laminated core formed by laminating thin magnetic plates made of a magnetic material. As shown in FIG. 3, the stator core 30 includes an annular portion 31 and a plurality of salient poles 32 that protrude radially inward from the annular portion 31. An annular outer peripheral surface of the annular portion 31 is an annular outer peripheral surface of the stator core 30. The outer peripheral surface of the stator core 30 is defined by the outer peripheral surface of the annular portion 31. The plurality of salient poles 32 are formed at equiangular intervals. Drive coils 4 (1) to 4 (12) are supported on each of the plurality of salient poles 32.

  Each drive coil 4 includes a coil bobbin 33, a coil wire 34 wound around the coil bobbin 33, and a pair of terminal pins 35 around which a terminal portion of the coil bobbin 33 is entangled. The coil bobbin 33 is formed of an insulating material such as a resin, and has a cylindrical portion 36 whose axis is directed in the radial direction, and a pair of flanges extending from both sides in the axial direction of the cylindrical portion 36 in a direction perpendicular to the axis. The terminal pin fixing part 38 provided in the upper part of one collar part 37 of the part 37 and the axial direction of the cylinder part 36 is provided. The terminal pin fixing portion 38 protrudes from the one flange portion 37 in the radial direction.

  The coil wire 34 is wound around the outer peripheral side of the cylindrical portion 36 between the pair of flange portions 37. The pair of terminal pins 35 is press-fitted into a fixing hole 38 a provided in the terminal pin fixing portion 38 and protrudes in the direction of the central axis L. A terminal portion of the coil wire 34 is wound around the terminal pin 35. The terminal portion of the coil wire 34 is in a loose state between the coil bobbin 33 and the terminal pin 35. Each drive coil 4 is supported by the stator core 30 with the cylindrical portion 36 of the coil bobbin 33 inserted into the salient pole 32 from the inside in the radial direction. As a result, the coil wire 34 is wound around the salient pole 32 via the coil bobbin 33.

  Here, the plurality of drive coils 4 (1) to 4 (12) have the same shape as each other, but the three drive coils 4 (1) to 4 (12) are arranged at positions overlapping the connector 9 when viewed from the central axis L direction. The drive coils 4 (1) to 4 (3) are opposite to the other nine drive coils 4 (4) to 4 (12) in the direction of insertion into the salient poles 32. That is, the three drive coils 4 (1) to 4 (3) are inserted into the salient poles 32 with the terminal pin fixing portion 38 positioned on the inner side in the radial direction, and the terminal pin fixing portion 38 is formed. The non-side flange 37 is brought into contact with the annular portion 31. The nine drive coils 4 (4) to 4 (12) are inserted into the salient poles 32 with the terminal pin fixing portion 38 positioned on the outer side in the radial direction, and the terminal pin fixing portion 38 is formed. The side flange 37 is brought into contact with the annular portion 31. In the nine drive coils 4 (4) to 4 (12), the terminal pin fixing portion 38 of the coil bobbin 33 has an upper end surface 38b (surface on the stator core 30 side) as an annular portion of the stator core 30 as shown in FIG. It is made to contact | abut to the lower end surface 31a of 31. FIG.

(Circuit board)
FIG. 4 is a plan view of the partition wall 18, the stator 5, the circuit board 7, and the connector 9 as viewed from below in the direction of the central axis L. The circuit board 7 is a rigid rigid board and has a substantially circular planar shape as a whole. The circuit board 7 is disposed in a state perpendicular to the central axis L direction at a position overlapping the plurality of drive coils 4 (1) to 4 (12) when viewed from the central axis L direction. The circuit board 7 is a double-sided board on which wiring patterns 43 of the drive circuit 6 are formed on both sides.

  As shown in FIG. 4, the drive circuit 6 includes a drive IC 40 for controlling power feeding to the plurality of drive coils 4 (1) to 4 (12) and a rotor around the central axis L based on the magnetic force of the drive magnet 2. 3 is provided with a Hall element (electronic element) 41 for detecting a rotation angle 3 and a resistor 42, and these are mounted on the circuit board 7.

  As shown in FIGS. 2 and 4, the circuit board 7 includes a first cutout portion 45 that is cut out in a straight line at a part of the outer periphery of the circuit board 7. In addition, a second cutout portion 46 is provided that is linearly cut out on the opposite side of the first cutout portion 45 with the central axis L interposed therebetween. The first cutout portion 45 and the second cutout portion 46 are used for positioning when forming the wiring pattern 43 or the like on the circuit board 7. Alternatively, the first cutout portion 45 and the second cutout portion 46 are used for positioning when mounting the electronic components of the drive circuit 6 on the circuit board 7. In addition, as shown in FIG. 4, the circuit board 7 has a plurality of terminal pin through holes (through holes) 47 through which the terminal pins 35 of the drive coils 4 pass, and a plurality of holes through which the terminals of the Hall element 41 pass. The element through hole 48, the fastening hole 50 constituting the fastening mechanism 49 for fixing the circuit board 7 to the partition wall 18, the two positioning holes 51 for positioning the circuit board 7 with respect to the partition wall 18, and the connector 9 Two connector fixing holes 53 constituting a connector fixing mechanism 52 for fixing the connector are formed. Each terminal pin 35 and the terminal of the hall element 41 are in a state of penetrating the circuit board 7 through the terminal pin through hole 47 and the hall element through hole 48, and the coil wire 34 entangled with each terminal pin 35. These terminal portions and the terminals of the Hall element 41 are soldered to a wiring pattern 43 on the board surface located on the opposite side of each drive coil 4.

  As shown in FIG. 4, the coil wire land 43 a that is a connection portion with the terminal portion of each drive coil 4 in the wiring pattern 43 is formed at the opening edge of each terminal pin through hole 47. In addition, a hall element land 43 b which is a connection portion with the terminal of the hall element 41 in the wiring pattern 43 is formed at the opening edge of the hall element through hole 48. In addition, the connector connection land 43 c that is a connection portion with the connector 9 in the wiring pattern 43 is formed so as to extend from the edge portion of the first cutout portion 45 in a direction orthogonal to the cutout. As shown in FIG. 2, the connector fixing holes 53 are provided on both sides of the connector connecting land 43c in the circumferential direction. Here, the connector 9 includes a connector terminal 55 extending in parallel with the circuit board 7 and fixing hooks 56 provided on both sides sandwiching the connector terminal 55 in the circumferential direction. The connector terminal 55 is used for connector connection. The fixing hook 56 is fitted into the connector fixing hole 53 by being soldered to the land 43 c and attached to the circuit board 7. That is, the fixing hook 56 and the connector fixing hole 53 constitute a connector fixing mechanism 52 that fixes the connector 9 to the circuit board 7.

  As shown in FIG. 4, among the plurality of terminal pin through holes 47 formed in the circuit board 7, the three drive coils 4 arranged at positions overlapping the connector 9 when viewed from the central axis L direction. Terminal pin through holes 47 (1) to 47 (3) for penetrating the terminal pins 35 of (1) to 4 (3) are formed inside the connector connection land 43c. The terminal pins 35 of the three drive coils 4 (1) to 4 (3) extend downward through the terminal pin through holes 47 (1) to 47 (3), respectively. A terminal portion of the coil wire 34 entangled with each terminal pin 35 is connected to a coil wire land 43a provided at an opening edge of each terminal pin through hole 47 (1) to 47 (3).

  Terminal pin through-holes 47 (4) to 47 () through which the terminal pins 35 of the nine drive coils 4 (4) to 4 (12) are removed except for the three drive coils 4 (1) to 4 (3). 12) is formed at the outer peripheral edge portion of the circuit board 7, and is arranged in the circumferential direction along the outer peripheral edge. The terminal pin through-holes 47 (4) to 47 (12) provided in the outer peripheral edge portion of the circuit board 7 are formed by cutting out the circuit board 7 from the outer peripheral side and open toward the outer peripheral side. doing. Each terminal pin 35 of the nine drive coils 4 (4) to 4 (12) extends downward through each of the terminal pin through holes 47 (4) to 47 (12). A terminal portion of the coil wire 34 entangled with each terminal pin 35 is connected to a coil wire land 43a provided at an opening edge of each terminal pin through hole 47 (4) to 47 (12).

  Here, the drive coil 4 (1), the drive coil 4 (4), the drive coil 4 (7), and the drive coil 4 (10) are electrically connected by the wiring pattern 43, and the U phase, V phase, Among the W phases, for example, the U phase is configured. The drive coil 4 (2), the drive coil 4 (5), the drive coil 4 (8), and the drive coil 4 (11) are electrically connected by the wiring pattern 43. The U phase, V phase, W Among the phases, for example, V phase is constituted. The drive coil 4 (3), the drive coil 4 (6), the drive coil 4 (9), and the drive coil 4 (12) are electrically connected by the wiring pattern 43, and are U phase, V phase, W Of the phases, for example, it constitutes the W phase. Accordingly, the three drive coils 4 (1) to 4 (3) arranged at positions overlapping the connector 9 when viewed from the central axis L direction are drive coils of different phases.

  A hall element through hole 48 is formed on one side in the circumferential direction of the terminal pin through holes 47 (1) to 47 (3) formed inside in the radial direction. A resistor 42 is mounted on the other side in the circumferential direction of the terminal pin through holes 47 (1) to 47 (3). In order to detect the magnetic force of the drive magnet 2 located inside the annular wall 20, the Hall element 41 is disposed close to the annular wall 20 of the partition wall 18 as shown in FIG. 2. The terminal of the hall element 41 extends downward through the hall element through hole 48, and the terminal is connected to the hall element land 43 b provided at the opening edge of the hall element through hole 48.

  On the central axis L of the circuit board 7, a drive IC 40 having a rectangular planar shape is arranged. The drive IC 40 is arranged in the space inside the terminal pin through holes 47 (1) to 47 (12) in the circuit board 7. As shown in FIG. 2, a fastening hole 50 is provided in the circuit board 7 between the second notch 46 and the driving IC 40, that is, at a position away from the central axis L in the radial direction. . The fastening hole 50 is located inside the plurality of drive coils 4 (1) to 4 (12) arranged in an annular shape and on the drive coil 4 (8) side farthest from the connector 9. As shown in FIG. 2, two positioning holes 51 are formed between the first cutout 45 and the central axis L. Here, the center of the fastening hole 50, the drive IC 40, the central axis L, and the connector 9 are located on a straight line, and the drive IC 40 has a longitudinal direction in the center of the fastening hole 50, the drive IC 40, the central axis L, and Arranged so as to be orthogonal to the virtual straight line L1 connecting the connectors 9. The terminals 40 a and 40 b of the driving IC 40 are respectively provided on a pair of side surfaces facing in the short direction of the driving IC 40, and the terminals 40 a provided on the side surfaces facing the connector 9 are connected to the connector terminals 55 by the wiring pattern 43. Is electrically connected. The two positioning holes 51 overlap the drive IC 40 when viewed from the central axis L direction, and are formed on both sides of the virtual straight line L1.

(housing)
FIG. 5 is a cross-sectional view of the partition wall 18, the stator 5, the circuit board 7, and the connector 9. As shown in FIGS. 2, 3, and 5, one fastening protrusion 60 for fixing the circuit board 7 to the partition wall 18 and the circuit board 7 are positioned on the lower surface of the plate-like wall portion 21 of the partition wall 18. Two positioning projections 61 are formed for this purpose. The fastening protrusion 60 is formed at a position corresponding to the fastening hole 50 of the circuit board 7 on the lower surface of the plate-like wall portion 21, and the positioning protrusion 61 is a position corresponding to the positioning hole 51 on the lower surface of the plate-like wall portion 21. Is formed.

  As shown in FIGS. 3 and 5, an annular step 60a is formed at the tip of the fastening projection 60, and the tip of the annular step 60a in the fastening projection 60 is an annular step 60a. The small diameter portion 60b is smaller in diameter than the base end side. The height dimension of the small-diameter portion 60b is shorter than the thickness dimension of the circuit board 7, and a screw hole 60c is formed in the tip surface of the small-diameter portion 60b. As shown in FIG. 3, an annular step portion 61a is formed at the distal end portion of the positioning projection 61, and the distal end side of the annular step portion 61a is more than the proximal end side of the annular step portion 61a. The small-diameter portion 61b has a small diameter. The height dimension of the small-diameter portion 61 b of the positioning protrusion 61 is shorter than the thickness dimension of the circuit board 7.

  Here, as shown in FIG. 5, the circuit board 7 is in a state in which the small-diameter portion 60 b of the fastening protrusion 60 is inserted into the fastening hole 50 and the small-diameter portion 61 b of the positioning protrusion 61 is inserted into the positioning hole 51. The plate 18 is fastened to the partition wall 18 with a head screw 63 screwed into the screw hole 60c through the washer 62 from the side of the substrate surface 7a on which the wiring pattern 43 is formed. That is, the fastening projection 60, the washer 62, and the headed screw 63 together with the fastening hole 50 constitute a fastening mechanism 49 that fixes the circuit board 7 to the partition wall 18. In a state where the circuit board 7 is fixed to the partition wall 18, the circuit board 7 is in a posture parallel to the plate-like wall portion 21 at a position spaced apart from the lower surface of the plate-like wall portion 21 in the central axis L direction. And is also positioned around the central axis L.

  As shown in FIGS. 3 and 5, longitudinal grooves (positioning portions) 64 are formed on the annular outer peripheral surface of the annular wall portion 20 of the partition wall 18. Each vertical groove 64 is a rectangular groove extending in the vertical direction, and is formed excluding a part on the plate-like wall part 21 side and a part on the partition wall part 22 side. Further, the plurality of vertical grooves 64 are formed on the entire circumference of the annular wall portion 20 at equal angular intervals. A convex portion 65 is formed between the plurality of vertical grooves 64.

  Here, as shown in FIG. 5, in a state in which the stator core 30 supports the drive coil 4, the salient pole 32 includes a protruding portion 32 a that protrudes radially inward from the cylindrical portion 36 of the coil bobbin 33. The protruding portion 32a is supported in a state of being positioned on the partition wall 18 by being fitted into the vertical groove 64 from below. That is, the vertical groove 64 can be fitted with the protruding portion 32a of the salient pole 32, and the stator 5 is positioned around the central axis L with respect to the partition wall 18 by fitting the protruding portion 32a into the fitting. . Further, the protruding portion 32 a contacts the inner peripheral surface portion 64 a at the upper end of the vertical groove 64, whereby the stator 5 is positioned with respect to the partition wall 18 in the central axis L direction. In a state where the stator 5 is positioned on the partition wall 18, the three drive coils 4 (1) to 4 (3) arranged at positions overlapping the connector 9 when viewed from the central axis L direction are radially inward. The terminal pin fixing portion 38 provided on the flange portion 37 is overlapped with the inner peripheral surface portion 64a in the central axis L direction, and both end portions in the circumferential direction of the upper end surface 38b are the lower end surface of the convex portion 65. It will be in the state contact | abutted to the part 65a (refer FIG. 3). Further, in the nine drive coils 4 (4) to 4 (12) that are arranged at positions that do not overlap the connector 9, the flange portion 37 that is located on the inner side in the radial direction is formed on the arc-shaped outer peripheral surface portion of the protrusion 65. It comes into contact.

  The resin sealing member 19 is for protecting the drive coil 4 and the circuit board 7 from a fluid, and is made of a resin such as an unsaturated polyester resin. The resin sealing member 19 is formed by injecting resin onto the partition wall 18 in a state where the stator 5 and the circuit board 7 are fixed. The resin sealing member 19 completely covers the drive coil 4 and the circuit board 7, and covers a part of the connector 9 except for the connector connecting portion 9 a protruding outward from the circuit board 7 in the connector 9.

  When injection molding the resin sealing member 19, the connector 9 is fixed to the circuit board 7, and the circuit board 7 and the stator 5 are fixed to the partition wall 18. Next, the stator 5 and the circuit board 7 are placed in the mold with the outer peripheral edge portion 22a (see FIG. 5) of the partition wall flange 22 and the connector connecting portion 9a of the connector 9 held by a mold (not shown). To do. Thereafter, the resin sealing member 19 is formed by injecting resin into the mold from one gate provided in the mold and curing the resin.

  Here, the gate is provided on the outer side of the circuit board 7 in the radial direction and closer to the fastening hole 50 than the connector 9. The gate is provided on the outer peripheral side of the drive coil 4. As a result, in the resin sealing member 19, a gate mark 70 is formed on the outer peripheral side of the drive coil 4 and closer to the fastening hole 50 than the connector 9, as shown in FIGS. Yes. In this example, the gate mark 70, the center of the fastening hole 50, the central axis L, the drive IC 40, and the connector 9 are located on a straight line.

(Function and effect)
According to this example, the fastening mechanism 49 for fixing the circuit board 7 to the partition wall 18 is provided at a position away from the central axis L outward in the radial direction. Therefore, compared with the case where the fastening mechanism 49 is provided on the central axis L, a space on the circuit board 7 can be secured. Therefore, it is easy to arrange the drive IC 40 that is a relatively large component on the circuit board 7. In addition, when the wiring pattern 43 of the drive circuit 6 is formed on the circuit board 7, the degree of freedom in designing the wiring pattern 43 is improved.

  Further, according to this example, since the fastening mechanism 49 is provided on the opposite side of the connector 9 across the central axis L, it is possible to secure a space in a portion close to the connector 9 and loss of power. Can be suppressed.

  Further, according to this example, the connector 9 includes the connector terminal 55 extending in parallel with the circuit board 7, and the connector terminal 55 is soldered to the connector connection land 43c. Accordingly, the connecting portion between the connector terminal 55 and the connector connecting land 43c is lengthened, and the coupling strength by soldering is improved. The connector 9 is attached to the circuit board 7 by engagement between a fixing hook 56 provided in the connector 9 and a connector fixing hole 53 provided in the board. Therefore, the connector 9 and the circuit board 7 are firmly fixed. Even when the resin sealing member 19 is molded, even if the connector connecting portion 9a of the connector 9 is held by a mold, the connector 9 is not connected to the circuit board. It will not deviate from 7.

  Next, in this example, when the resin sealing member 19 is molded using a mold, the resin is radially outward from the circuit board 7 and closer to the fastening mechanism 49 than the connector 9. Injected. When viewed from the direction of the central axis L, the gate (gate trace 70), the center of the fastening hole 50, the central axis L, and the connector 9 are located on a straight line. Therefore, the circuit board 7 can be prevented from being bent by the injected resin. Further, the resin is injected from the side of the drive coil 4 with respect to the circuit board 7 in the direction of the central axis L, and the wiring pattern 43 of the drive circuit 6 has a plurality of drive coils 4 (1) to 4 ( 12) on the opposite side of the substrate surface 7a. Therefore, when the resin sealing member 19 is molded using a mold, it is prevented or suppressed that the wiring pattern 43 provided on the circuit board 7 is peeled off by the injected resin.

  Further, since the longitudinal direction of the drive IC 40 is orthogonal to the gate (gate mark 70), the center of the fastening hole 50, the central axis L, and the virtual straight line L1 connecting the connector 9, the resin sealing member 19 is molded. The length of the drive IC 40 in the direction in which the circuit board 7 bends is short. As a result, the drive IC 40 is prevented from being peeled off or damaged from the substrate.

  Furthermore, since the terminal portion of the coil wire 34 of each drive coil 4 is entangled with the terminal pin 35 in a relaxed state, when the resin sealing member 19 is molded, the coil wire 34 is made of resin injected. The terminal portion is prevented or suppressed from being disconnected.

(Other embodiments)
In the above example, the drive magnet 2 of the rotor 3 is arranged inside the plurality of drive coils 4 (1) to 4 (12) arranged in an annular shape, but the drive magnet 2 of the rotor 3 is arranged in an annular shape. The present invention can also be applied to the pump device 1 having a configuration (outer rotor) arranged outside the plurality of arranged drive coils 4 (1) to 4 (12).

  In the above example, the fastening mechanism 49 for fixing the circuit board 7 to the partition wall 18 includes the fastening hole 50, the fastening protrusion 60, and the headed screw 63. The circuit board 7 may be fixed to the partition wall 18 by caulking or the like.

  Furthermore, in the above example, there is only one gate for injecting resin in the mold, but the resin sealing member 19 may be molded using a mold having a plurality of gates. In this case, if at least one gate is provided on the outer side of the circuit board 7 in the radial direction and closer to the fastening hole 50 than the connector 9, the circuit board 7 is formed when the resin sealing member 19 is molded. Bending can be suppressed.

DESCRIPTION OF SYMBOLS 1 ... Pump apparatus 3 Rotor 4, 4 (1)-4 (12) Drive coil 5 Stator 6 Drive circuit 7 Circuit board 7a Board surface 8 Impeller 9 -Connector 15-Pump chamber 18-Bulkhead 19-Resin sealing member 33-Coil bobbin 34-Coil wire 35-Terminal pin 40-Drive IC
43..Wiring pattern 43c..Connector connecting lands 47, 47 (1) to 47 (12) .. Terminal pin through hole (through hole)
49 .. Fastening mechanism 52. Connector fixing mechanism 53 Connector fixing hole (circuit board side fixing part)
55 ・ ・ Connector terminal 56 ・ ・ Hook for fixing (Connector side fixing part)
70 ... Gate trace L ... Central axis L1 ... Virtual straight line

Claims (12)

A rotor to which an impeller is attached;
A stator comprising a plurality of drive coils arranged in a ring;
A drive circuit for performing power feeding control to the plurality of drive coils, and when viewed from the central axis direction of the plurality of drive coils, is in a state orthogonal to the central axis direction at a position overlapping the plurality of drive coils. A placed circuit board; and
The pump chamber in which the impeller is disposed and the circuit board and the stator are separated from each other, and a partition wall to which the circuit board and the stator are fixed,
Each drive coil includes a terminal pin that protrudes in the direction of the central axis in a state where the terminal portion of the coil wire is entangled,
The circuit board includes a plurality of through holes through which the terminal pins of the respective drive coils penetrate, and a wiring pattern of the drive circuit in which terminal portions of the coil wires are electrically connected,
The pump device according to claim 1, wherein a fastening mechanism for fastening the circuit board and the partition wall is provided at a position away from the central axis in the radial direction. In claim 1,
The drive circuit includes a drive IC for controlling power feeding to the plurality of drive coils,
The pump device, wherein the drive IC is disposed on the central axis of the circuit board. In claim 2,
A connector for supplying electric power from the outside to the drive circuit;
The connector is electrically connected to the wiring pattern in a state of being fixed to an outer peripheral edge portion of the circuit board located on the opposite side of the fastening mechanism across the central axis. apparatus. In claim 3,
A pump apparatus comprising: a resin sealing member fixed to a surface of the partition opposite to the pump chamber in a state of covering the stator, the circuit board, and a part of the connector. . In claim 4,
The connector includes a connector terminal extending in parallel with the circuit board,
The pump device according to claim 1, wherein the wiring pattern includes a connector connection land in which the connector terminal is soldered to an outer peripheral edge portion of the circuit board. In claim 5,
A connector fixing mechanism for fixing the connector to the circuit board;
The connector fixing mechanism includes a circuit board side fixing portion provided on both sides in the circumferential direction of the connector connecting land on the circuit board, and a connector side fixing provided on both sides in the circumferential direction of the connector terminal in the connector. And a pump device. In any one of claims 4 to 6,
The pump device, wherein a gate mark of the resin sealing member is located on the outer side in the radial direction with respect to the circuit board and closer to the fastening mechanism than the connector. In claim 7,
The gate mark is provided on the side of the plurality of drive coils with respect to the circuit board in the central axis direction,
The said wiring pattern is provided in the board | substrate surface on the opposite side to these drive coils in the said circuit board, The pump apparatus characterized by the above-mentioned. In claim 7 or 8,
The gate mark is one place,
The pump device, wherein the gate mark, the fastening mechanism, the central axis, the drive IC, and the connector are positioned on a straight line when viewed from the central axis direction. In claim 9,
The driving IC has a rectangular planar shape when viewed from the central axis direction, and the longitudinal direction is orthogonal to a virtual straight line connecting the gate mark, the fastening mechanism, the central axis, the driving IC and the connector. A pump device characterized by. In any one of claims 4 to 10,
Each drive coil includes a coil bobbin around which the coil wire is wound,
The pump device, wherein a terminal portion of the coil wire of each drive coil is in a loose state between the coil bobbin and the terminal pin. In the manufacturing method of the pump device according to claim 4,
Fixing the connector to the circuit board and fixing the stator and the circuit board to the partition;
With the outer peripheral edge portion of the partition wall and the connector connecting portion protruding outward from the circuit board in the connector held by the mold, the stator and the circuit board are disposed in the mold,
A pump device characterized in that the resin sealing member is molded by injecting resin into the mold from a position closer to the fastening mechanism than the connector and outside the circuit board in the radial direction. Production method.

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